What’s The Verdict On Masks For COVID-19 Protection?
The answer: It’s complicated and you’re probably doing it wrong
- In June 2020, the World Health Organization endorsed the use of facemasks to curb the transmission of COVID-19. The CDC has also endorsed mask wearing.
- Nevertheless, most people remain confused on the exact function of masks, especially related to the different functions of “respirators” versus standard face masks.
- Even those who are using masks are often wearing them incorrectly, or contaminating their mask with frequent readjustments.
- Here our physician writer summarizes what you need to know to protect yourself and your family.
It doesn’t take a genius to notice that face masks are here to stay. Despite early tweets to the contrary by the Surgeon General, scientists and public health officials now agree that widespread use of facemasks can slow the spread of COVID-19. Combined with social distancing, mask use lowers the “R” value associated with the outbreak. The “R” is the average number of people an infected individual will subsequently infect, so an R greater than 1 means the virus is spreading (each individual infects more than one other person) and an R less than 1 means that it is on the decline. You can track your state’s evolving R via this website. The value is representative of the success of public health efforts.
Types of Masks
Cloth Masks and Standard Surgical Face Masks
Let’s start by clearing up some confusion around the different types of face covering. Your standard surgical mask or other non-airtight face cover (e.g. a bandana) provides you with some limited protection from virus droplets in the air. Wearing these masks also reminds you not to touch your face, thus avoiding self-inoculation with any virus particles you picked up since then last time you washed your hands. The primary purpose of these masks, however, is to limit the droplets generated from your exhaled breath. Droplets are relatively large virus-carrying mucus or saliva particles that can transmit the virus. A person wearing a mask limits the potential that their droplets might infect the people around them, since their masks act as a barrier when they cough, sneeze, or exhale. Given that many contagious individuals have no symptoms, masks need to be worn by everyone where social distancing is not possible, not just by those feeling ill.
Not all facemasks are created equal. Whether you’re using a store bought or homemade version, the effectiveness of your mask could depend on the material used to make it or how it fits on your face. Any facial covering is better than no facial covering, but the best face masks will be made of heavy cotton or multiple layers of cloth.
A different type of face covering, primarily used by health providers, is called a “respirator.” These form an airtight seal around your face so that all of the air you breath in is filtered through the mask. These protect the wearer from exposure to particles that are airborne, i.e. smaller and more resilient than droplets. The classic respirator is known as an “N-95” mask, since it filters out at least 95% of these inhaled particles. Respirators are not designed for prolonged use and some wearers experience difficulty breathing while wearing them.
Comparing Surgical Masks and Respirators
|Cloth or surgical mask||N95 Respirator|
|Purpose/Topline||Provides you with some minimal protection (prevents you from self contaminating mouth/nose), provides protection against droplets, minimal airborne particle protection||Provides significant protection against both airborne particles and droplets, difficult to wear for prolonged periods of time|
|Fit||Loose||Tight seal, requires “FIT” testing to ensure it works for your face shape. Facial hair will interfere with the seal.|
|Filtration of airborne particles||Minimal to none, airborne particles pass through gaps in the fit||Filters out 95% of airborne particles|
|Reuse?||Discard or wash after every use||Ideally discard disposable type respirators. Definitely discard if it gets contaminated by blood or nasal/respiratory secretions. Definitely discard if it gets wet or dirty. Definitely discard if it no longer forms a tight seal.|
Source: Adapted from CDC infographic here.
How to use your mask
Whichever mask you choose to wear, be sure to put it on and take it off properly. It is easy to contaminate the surface of your mask if you don’t follow a stepwise approach. When removing your mask, consider the front of the mask as a contaminated surface. Begin by washing your hands, then remove the mask by the ear ties, discard the mask or set it aside for cleaning, and wash your hands again.
How to properly wear a cloth mask / surgical mask
Step 1: Wash your hands (use hand sanitizer if you don’t have access to soap and running water).
Step 2: Place the mask on your face, fitting it over your nose and chin. If the mask has a way to adjust the fit at the nose, do this now to ensure a tight seal.
Step 3: Place the mask straps around your ears or tie them behind your head.
Step 4: When it’s safe to remove your mask, start by washing or sanitizing your hands again.
Step 5: Untie the mask straps or remove the loops from around your ears and pull the mask away from your face (avoid touching the front surface of the mask).
Step 6: Dispose of the mask or place it in a paper bag for future cleaning
Step 7: Wash or sanitize your hands one last time.
How to dispose of or clean your mask
Final point: If your mask is disposable, be sure to dispose of it in a garbage can. No one wants to pick up your medical waste!
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